NethServer Version: 7.7
Module: cockpit, nextcloud
You have long running installs of nextcloud on nethserver.
You upgrade to 7.7 and cockpit.
You’re playing with reverse proxy.
You use the empty trusted domain entry field for the first time in the cockpit nextcloud settings to add a domain you created for letsencrypt testing.
You wait awhile until everyone starts complaining about none of their nextcloud services working because you wiped out the other 4 trusted domains from the original config.
Have a beer.